feat: Reinitialize frontend with SvelteKit and TypeScript

- Delete old Vite+Svelte frontend
- Initialize new SvelteKit project with TypeScript
- Configure Tailwind CSS v4 + DaisyUI
- Implement JWT authentication with auto-refresh
- Create login page with form validation (Zod)
- Add protected route guards
- Update Docker configuration for single-stage build
- Add E2E tests with Playwright (6/11 passing)
- Fix Svelte 5 reactivity with $state() runes

Known issues:
- 5 E2E tests failing (timing/async issues)
- Token refresh implementation needs debugging
- Validation error display timing

frontend/node_modules/happy-dom/lib/nodes/html-li-element/HTMLLIElement.js

@@ -0,0 +1,30 @@
+import HTMLElement from '../html-element/HTMLElement.js';
+/**
+ * HTMLLIElement
+ *
+ * @see https://developer.mozilla.org/en-US/docs/Web/API/HTMLLIElement
+ */
+export default class HTMLLIElement extends HTMLElement {
+    /**
+     * Returns value.
+     *
+     * @returns Value.
+     */
+    get value() {
+        if (!this.hasAttribute('value')) {
+            return 0;
+        }
+        const parsedValue = Number(this.getAttribute('value'));
+        return isNaN(parsedValue) ? 0 : parsedValue;
+    }
+    /**
+     * Sets value.
+     *
+     * @param value Value.
+     */
+    set value(value) {
+        const parsedValue = Number(value);
+        this.setAttribute('value', isNaN(parsedValue) ? '0' : String(parsedValue));
+    }
+}
+//# sourceMappingURL=HTMLLIElement.js.map